UNC

The UNC (Gas Transportation Uniform Network Code) governs gas transportation on independent gas networks, meaning pipelines not owned by the four Gas Distribution Networks (GDNs). Gas Transportation (iGTs) operate networks that typically serve new-build housing developments and commercial sites. Gemserv (now Joint Office of Gas Transporters) administers the code.

The modification process

Any party to the UNC can propose a modification. Once raised, the UNC Panel decides whether to send it to a Workgroup for development or handle it directly. The Workgroup produces a report, and the Panel then votes. Modifications that could materially affect consumers, competition, or the gas market require an Authority Decision from Ofgem. Self-Governance modifications are decided by the Panel alone.

Key concepts

• Self-Governance applies when a modification will not materially affect consumers, competition, or gas system security. The Panel decides directly.
• Authority Decision means Ofgem makes the final decision. This applies to modifications with broader market impact.
• Alignment with UNC: many UNC modifications mirror changes to the main Uniform Network Code, ensuring consistent rules across all gas networks.